CN214475888U

CN214475888U - Electric power simulation operation system

Info

Publication number: CN214475888U
Application number: CN202022911964.5U
Authority: CN
Inventors: 孟广磊
Original assignee: Beijing Quemako Intelligent Technology Co ltd
Current assignee: Beijing Quemako Intelligent Technology Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-10-22
Anticipated expiration: 2030-12-07

Abstract

A power simulation run system comprising: a secondary loop of the power system is connected with a loop simulation physical model of the primary loop of the power system, and data acquisition and monitoring are carried out; the simulation physical model of the primary loop comprises a simulation load for simulating the load in the primary loop, a simulation power supply for simulating the high-voltage grade in the primary loop, a power transformer, a breaker, a current transformer and a voltage transformer, a simulation breaker, a simulation current transformer and a simulation voltage transformer, wherein the connection mode of the simulation power supply, the simulation transformer, the simulation breaker, the simulation current transformer and the simulation voltage transformer is the same as that of the high-voltage grade power supply in the primary loop, the power transformer, the breaker, the current transformer and the voltage transformer, so that various real-time electrical parameters in the operation process of the primary loop are simulated.

Description

Electric power simulation operation system

Technical Field

The utility model belongs to the electrical equipment field relates to an electric power simulation operation system that is used for professional technical training or technical skill examination.

Background

The power system has the working characteristic of long-term continuous operation, so that once the electrical equipment is put into operation, the electrical equipment has few chances to stop, and the electrical equipment in operation is not allowed to be operated by operators and engineering technicians, so that the electrical equipment does not have the condition of training and checking by adopting actual operation equipment. Therefore, technical and skill training of electric personnel is mostly performed in the forms of theoretical learning, anti-accident exercise of talking about on paper and the like, and the training in the forms has no real operating environment and is completely dependent on the understanding and imagination of trained personnel, so that the training effect is poor, and the whole professional ability of the electric professionals is not high.

Specifically, the primary circuit (also called primary system, primary part, main circuit) of the power system is a main body constituting a power grid, and is equipment for directly producing, transmitting, distributing and consuming electric energy, and includes a generator, a power transformer, a circuit breaker, a disconnecting switch, a bus, a current transformer, a voltage transformer, a power cable, a power transmission line, electric equipment and the like.

The secondary circuit (also called secondary system or secondary part) of the power system refers to all the electrical circuits except the primary circuit of the power system, which are arranged for ensuring the normal operation of the primary circuit of the power system, and mainly comprises: control circuit, protection circuit, measurement circuit, signal circuit, automation equipment, power supply system and integrated automation monitoring system (SCADA system).

The existing power system training and assessment mainly has four modes. However, these training modes and training assessment devices have many problems.

The existing first power system training and assessment mode is pure digital simulation realized by adopting computer software. The method takes a simulation mathematical model of the power grid as a core, simulates the switching operation, accident handling and other processes of the transformer substation, can simulate and simulate more complicated switching operation and accident occurrence processes of the power grid, but the training of the switching operation and the like through a computer picture has great defects in the reality and detail simulation of the operation environment, and is not suitable for the training of technical personnel and the safety skill examination.

The second existing power system training and checking mode is pure physical simulation which adopts a relay protection tester as a signal source. Although the method can simulate the signals under the normal operation of the power grid, the output of the signals is isolated and unidirectional, and because the method does not have a simulation model of the power grid, the real-time dynamic change characteristics of the voltage, the current and other electrical parameters of the primary loop cannot be reflected, and the simulation systematicness is insufficient.

The third existing power system training and assessment mode is digital physical hybrid simulation of a transformer substation. The method also takes a simulation mathematical model of the power grid as a core, simulates the circuit parameters of the primary loop through the power amplifier of the voltage and the current to form a simulation system, can reflect the dynamic characteristics of the voltage and the current signals of the primary loop in real time, but has larger defects on the authenticity of a simulation operation function and environment and the integrity of the system, and limits the scale of the simulation system due to the higher manufacturing cost of the power amplifier.

The existing fourth power system training and checking mode is that a primary loop is built on real high-voltage electrical equipment. When the equipment is used for training, if a high power supply is not switched on, all electrical parameters of the system cannot be displayed, the training can only be stopped on simple operation of the equipment, the training content is single, and the effect is poor; if the high-voltage power supply is connected, the training effect is good, but the safety risk is high. The equipment also has the defects of high equipment cost, high site requirement and the like.

Thus, a more realistic, specialized training apparatus is needed to change the status of such training and assessment.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electric power simulation operation system, the operating parameter in return circuit can real-time simulation electric power system, and the security is good, systematic strong, operating characteristic is good.

The utility model provides an electric power simulation operation system, electric power simulation operation system includes the emulation physical model and the electric power system secondary circuit of electric power system primary circuit, the electric power system secondary circuit with the circuit emulation physical model of electric power system primary circuit links to each other, and carry out data acquisition and control to the emulation physical model of electric power system primary circuit; the simulation physical model of the primary loop of the power simulation operation system comprises a simulation load for simulating the load in the primary loop of the power simulation operation system, a power supply for simulating a high-voltage grade in the primary loop of the power simulation operation system, a power transformer, a withdrawable (high-low voltage) circuit breaker, a low-voltage grade simulation power supply of a current transformer and a voltage transformer, a simulation withdrawable (high-low voltage) circuit breaker, a simulation current transformer and a simulation voltage transformer, wherein the connection modes of the simulation power supply, the simulation transformer, the simulation withdrawable (high-low voltage) circuit breaker, the simulation current transformer and the simulation voltage transformer are the same as the connection modes of the high-voltage grade power supply, the power transformer, the withdrawable (high-low voltage) circuit breaker, the current transformer and the voltage transformer in the primary loop of the power simulation operation system, so as to simulate various real-time electrical parameters in the operation process of the primary loop of the power simulation operation system.

Further, the power system primary loop simulation physical model comprises a simulation transformer, and the ratio of the primary side voltage and the secondary side voltage of the simulation transformer is at least one of the following ratios:

less than or equal to 20: 1; less than or equal to 10: 1; less than or equal to 5: 1; less than or equal to 2: 1; and equal to 1: 1.

further, the primary-side voltage and the secondary-side voltage of the artificial transformer are 34V.

Further, the power system primary loop simulation physical model comprises a simulation power supply which is a low-voltage power supply with a neutral point directly grounded.

Further, the power system primary loop simulation physical model comprises a simulation shift-out (high-low voltage) circuit breaker, and the simulation shift-out (high-low voltage) circuit breaker realizes simulation of the positions (working position, test position, maintenance position), the switching-on/off states (switching-on position and switching-off position) and the switching-on/off operation functions of an actual circuit breaker by using a control circuit designed by an electromagnetic latching relay and a contactor.

Further, the power system primary loop simulation physical model comprises a simulation current transformer, and the ratio of the primary side current to the secondary side current of the simulation current transformer is at least one of the following ratios:

less than or equal to 50: 1; less than or equal to 20: 1; less than or equal to 10: 1; less than or equal to 5: 1; less than or equal to 2: 1; and equal to 1: 1.

further, the primary side rated current of the simulation current transformer is at least one of the following values: less than or equal to 100A; less than or equal to 50A; less than or equal to 20A; less than or equal to 10A.

The power system primary loop simulation physical model comprises a simulation voltage transformer, and the ratio of the primary side voltage to the secondary side voltage of the simulation voltage transformer is at least one of the following ratios:

less than or equal to 1: 1; less than or equal to 0.5: 1; equal to 34: 100.

further, the primary side rated voltage of the simulated physical voltage transformer is at least one of the following values:

less than or equal to 100V; less than or equal to 50V; equal to 34V.

Further, the artificial load is used for simulating the impedance of the power system primary loop, so as to simulate the load current in the power system primary loop.

Furthermore, the secondary circuit of the power system comprises a control circuit, a protection circuit, a measurement circuit, a signal circuit, an automatic device, a power supply system and a comprehensive automatic monitoring system, and the secondary circuit of the power system is connected with the simulation physical model of the primary circuit of the power system to acquire and monitor data of the simulation physical model of the primary circuit of the power system.

According to another aspect of the present invention, there is provided a control method for an electric power simulation operation system, wherein the electric power simulation operation system includes a physical simulation model of a primary loop of an electric power system and a secondary loop of the electric power system; the simulation physical model of the primary loop of the power simulation operation system comprises a simulation load for simulating the load in the primary loop of the power simulation operation system, a power supply for simulating a high-voltage grade in the primary loop of the power simulation operation system, a power transformer, a simulation power supply for simulating a low-voltage grade of a current transformer and a voltage transformer, a simulation current transformer and a simulation voltage transformer

Connecting the secondary loop of the power system with a loop simulation physical model of the primary loop of the power system, and performing data acquisition and monitoring on the simulation physical model of the primary loop of the power system;

and setting the connection modes of the simulation power supply, the simulation transformer, the simulation current transformer and the simulation voltage transformer in the same mode as the connection modes of the power supply, the power transformer, the current transformer and the voltage transformer with high voltage levels in the primary loop of the power simulation operation system so as to simulate various real-time electrical parameters in the operation process of the primary loop of the power simulation operation system.

less than or equal to 50: 1; less than or equal to 20: 1; less than or equal to 10: 1; less than or equal to 5: 1; less than or equal to 2: 1; and equal to 1: 1

Further, the power system primary loop simulation physical model comprises a simulation voltage transformer, and the ratio of the primary side voltage to the secondary side voltage of the simulation voltage transformer is at least one of the following ratios:

less than or equal to 1: 1; less than or equal to 0.5: 1; equal to 34: 100.

less than or equal to 100V; less than or equal to 50V; equal to 34V.

The utility model discloses electric power simulation operation system is connected with electric power system secondary circuit through electric power system primary circuit emulation physical model, forms the complete system that can operate, has consequently solved the problem of system emulation; the power system primary loop simulation physical model can be electrified to run actually, so that the problem of real-time parameter simulation of the power system primary loop is solved; the physical simulation model of the primary loop of the power system adopts the low-voltage power supply, so that the problem of safety risk of the primary loop of the power system adopting the high-voltage power supply to operate is solved, the operation parameters of the primary loop of the power system can be simulated in real time, and the physical simulation model has the advantages of good safety, strong systematicness and good operation characteristics.

Drawings

Fig. 1 is a schematic diagram of an analog simulation physical model of a primary loop of an electric power system according to an embodiment of the present invention.

Fig. 2 is a comparison diagram of an analog simulation physical power supply and an actual power supply provided by an embodiment of the present invention.

Fig. 3 is a schematic diagram of a primary loop of a practical 10kV power distribution system provided by an embodiment of the present invention.

Fig. 4 is a schematic diagram of a "10 kV distribution system primary loop simulation physical model" provided by the embodiment of the present invention.

Fig. 5 is a schematic diagram of a voltage signal and secondary circuit standard interface structure provided in an embodiment of the present invention.

Fig. 6 is a schematic diagram of a current signal and secondary circuit standard interface structure provided in an embodiment of the present invention.

Fig. 7 is a circuit diagram of the internal simulation control of the withdrawable circuit breaker according to the embodiment of the present invention.

Fig. 8 is a secondary control circuit diagram of the withdrawable circuit breaker according to the embodiment of the present invention.

Fig. 9 is a circuit diagram of a primary main circuit control circuit of a withdrawable circuit breaker according to an embodiment of the present invention.

Fig. 10 is a flowchart of a control method suitable for an electric power simulation operation system according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the present invention is not limited to the drawings and the following embodiments.

The utility model discloses each embodiment indicates to adopt low pressure power supply to electric power system primary circuit emulation physical model, and the physical circuit of putting up through designs such as power transformer, circuit breaker, isolator, generating line, current transformer, voltage transformer, power cable and transmission line of emulation can simulate various real-time parameters (electric current, voltage, frequency, power, phase place etc.) in the electric power system primary circuit operation process.

Fig. 1 shows a simulation physical model of a primary loop of an electric power system according to an embodiment of the present invention. As shown in fig. 1, various simulation physical devices are connected into a whole (i.e. a power system primary loop simulation physical model) according to a connection manner of an actual power system primary loop, where the various simulation physical devices mainly include: power supplies, circuit breakers, disconnecting switches or disconnecting trolleys, current transformers, voltage transformers, loads and the like. After the three-phase power supply is connected to the power system primary loop simulation physical model, the change rule of parameters such as internal current and voltage of the power system primary loop simulation physical model conforms to the basic electric law such as ohm law and the like, the power system primary loop simulation physical model can be considered as a real running actual circuit with low voltage, low current and small capacity, so the power system primary loop simulation physical model is called as the power system primary loop simulation physical model, and compared with the high voltage, high current and large capacity of the power system primary loop, the change characteristics of other electrical parameters are basically consistent except for the difference in magnitude. The principle is that the primary loop operation characteristic of the power system is simulated by a primary loop simulation physical model of the power system.

In fig. 1, reference numeral 1 is a simulation physical (zero sequence) current transformer, which can determine equipment parameters according to the design requirements of a primary loop; 2, a charged display can adopt actual equipment; 3, the simulation physical voltage transformer can determine equipment parameters according to the design requirements of a primary circuit; 4, a fuse protector can adopt actual equipment; 5, an isolation handcart can adopt actual equipment; 6, the simulated physical high-voltage withdrawable circuit breaker can determine equipment parameters according to the design requirements of a primary circuit; 7, the simulation physical current transformer can determine equipment parameters according to the design requirements of a primary circuit; 8, a lightning arrester can adopt actual equipment; 9 is a grounding knife switch, and actual equipment can be adopted; 10 is a circuit, and actual equipment can be adopted; 11, the simulation physical transformer can determine equipment parameters according to the design requirements of a primary loop; 12, a simulated physical low-voltage withdrawable circuit breaker, which can determine equipment parameters according to the design requirements of a primary circuit; 13 is a simulation physical power supply, and the capacity can be calculated according to the design requirement of a primary loop; 14 is a bus, and actual equipment can be adopted; and 15, simulating physical loads, and determining equipment parameters according to the design requirements of a primary loop.

Continuing with fig. 1, real simulated physical devices such as the simulated physical power supply 13, the bus 14, the simulated

physical loads

15 and 1 to 12 (it is understood that these simulated physical devices are real physical devices, and are different from the parameter specification of the simulated devices) are used to build a primary loop of the power system according to the design requirements of the power system, namely a power system primary loop simulation physical model which is provided with the functions of simulating the running state of a real power system primary loop (including power transmission, power transformation, power distribution and power consumption), the standard interface is connected with a real secondary loop of the power system to form a complete power system training and checking device, and the external operating characteristics of the primary loop equipment of the power system and various electrical characteristics of the power system are simulated in real time, so that the whole process and the whole system of the operation of the power system can be simulated.

The embodiment of the present invention provides that the above-mentioned power system primary loop simulation physical model is an operable complete system, and therefore, the problem of system simulation (i.e. the problem existing in the second mode in the background art) is solved. The physical simulation model of the primary loop of the power system can be electrified to run actually, so that the problem of real-time parameter simulation of the primary loop of the power system (namely the problem existing in the fourth mode of the background technology) is solved. The physical simulation model of the primary loop of the power system adopts the low-voltage power supply, so that the problem of safety risk of the primary loop of the power system adopting the high-voltage power supply for operation (namely the problem existing in the existing fourth mode) is solved.

The embodiment of the utility model provides a still provide a emulation physics power. One form of such an emulated (physical) power supply is shown in figure 2. In a three-phase ac power system, the neutral points of a generator and a transformer as a power supply source are: the three operation modes of ungrounded, impedance grounded and direct grounded, different power supply neutral point grounding modes, the operation mode, protection configuration, fault type and the like of the system have great differences. The embodiment of the utility model provides a power that electric power system primary circuit emulation physical model adopted is the low voltage power supply of neutral point direct ground connection, consequently need convert this power to the power neutral point ground connection mode of emulation system. Such as: the power supply of 10kV distribution system is usually obtained by 110kV/10kV two-coil transformer with connection group Yd11, the neutral point of 10kV system is the operation mode of grounding through small resistance, and since no neutral point is led out from 10kV side of the transformer, a grounding transformer must be added in the system to obtain the neutral point. The embodiment of the utility model provides a simulation physical power source then is directly acquireed the neutral point through the transformer that the terminal group is Dyn11 to emulation 10kV distribution system's electrical operating characteristic. Because the simulated physical power supply adopts power frequency 34V safe voltage, the safety risk problem that the primary loop of the power system adopts a high-voltage power supply to operate (namely the problem existing in the existing fourth mode) is solved. Therefore, the embodiment of the utility model provides a simulated physics power has solved the problem of the power system neutral point operation mode emulation of different voltage classes.

The embodiment of the utility model provides a still provide an emulation (physics) current transformer. In a three-phase ac power system, a current transformer is a special transformer for converting a large current of a high voltage level into a small current of a low voltage level, such as: 1000/5, the transformation ratio is 200, which represents that when 1000A current flows through the primary side of the current transformer, 5A current flows through the secondary side of the current transformer. For example, when the characteristic of the current transformer 1000/5 is simulated by using the current transformer of 10/5, that is, when 10A current flows through the primary side of the current transformer, 5A current flows through the secondary side of the current transformer, and this 5A current can represent 1000A current, so as to achieve the purpose of simulating 1000A current in the primary loop of the power system by using the 10A current in the simulation physical model of the primary loop of the power system, the current transformer of 10/5 is a simulation physical current transformer. Therefore, the embodiment of the present invention provides a simulation physical current transformer, which realizes the purpose of simulating 1000A current in the primary loop of the power system with 10A current in the primary loop simulation physical model of the power system. The embodiment of the utility model provides an in emulation physics current transformer be real physical equipment, can realize the isolation of electric power system primary circuit emulation physical model and electric power system secondary circuit.

The embodiment of the utility model provides a still provide an emulation (physics) voltage transformer. In a three-phase ac power system, a voltage transformer is a special transformer for converting a high voltage into a low voltage, such as: 10000/100, the transformation ratio is 100, which represents that when the primary side of the transformer has 10000V voltage, the secondary side of the transformer has 100V voltage. For example, when the characteristic of the voltage transformer of 10000/100 is simulated by using the voltage transformer of 34/100, that is, when 34V voltage is represented on the primary side of the voltage transformer, 100V voltage is represented on the secondary side of the voltage transformer, and the 100V voltage can represent 10000V voltage, so that the purpose of simulating 10000V voltage in the primary loop of the power system by using 100V voltage in the physical model of the primary loop simulation of the power system is achieved, and the voltage transformer of 34/100 is a simulated physical voltage transformer. Therefore, the above-mentioned emulated physical voltage transformer provided by the embodiment of the present invention achieves the purpose of emulating an extremely high voltage (e.g. 10000V voltage) in a primary loop of a power system with a safe voltage (e.g. 34V voltage) in a primary loop emulated physical model of the power system. The utility model discloses an in the embodiment, emulation physics voltage transformer is real physical equipment, can realize the isolation of electric power system primary circuit emulation physical model and electric power system secondary circuit.

The embodiment of the utility model also provides an emulation (physics) transformer. In a three-phase ac power system, a transformer is a device that transforms voltage, such as: 10000/100, the transformation ratio is 100. If the characteristics of the transformer of 10000/400 are simulated by using the simulated physical transformer of 34/34, namely the primary side 34V voltage of the simulated physical transformer represents 10000V, and the secondary side 34V voltage of the simulated physical transformer represents 400V, the purpose of simulating 10000V system voltage in a primary loop of an electric power system by using the 34V voltage of the high-voltage side of the simulated physical transformer and simulating 400V system voltage in the primary loop of the electric power system by using the 34V voltage of the low-voltage side of the simulated physical transformer is achieved, and meanwhile, the simulated large-capacity transformer of the small-capacity transformer is realized, and the transformer of 34/34 is the simulated physical transformer. Therefore, the embodiment of the present invention provides an emulated physical transformer, which realizes the purpose of emulating the high voltage (e.g. 10000V system voltage) in the primary loop of the power system with the safe voltage (e.g. 34V voltage) on the high-voltage side of the emulated physical transformer, and emulating the non-safe voltage (e.g. 400V system voltage) in the primary loop of the power system with the safe voltage (e.g. 34V voltage) on the low-voltage side of the emulated physical transformer. Therefore, the simulated physical transformer realizes the conversion between different grades of voltage systems (such as the conversion between a 10000V system and a 400V system).

The embodiment of the utility model provides a still provide an emulation (physics) withdrawable (high-low voltage) circuit breaker. The simulation physical movable (high-low voltage) circuit breaker can be used for simulating the positions (working position, test position and maintenance position), the switching-on/off states (switching-on position and switching-off position) and the operating characteristics of an actual circuit breaker. The simulation of the position and the operating characteristics of the circuit breaker is completed by adopting a handcart and an operating mechanism of an actual circuit breaker, a main contact, an arc extinguishing device and other main circuit parts on the circuit breaker are removed, and the opening and closing operation of the circuit breaker is simulated by controlling the opening and closing of a contactor through an auxiliary contact of the operating mechanism of the circuit breaker. Therefore, the embodiment of the utility model provides an above-mentioned emulation physics withdrawable (high-low pressure) circuit breaker has realized the analog simulation to position (work position, experimental position, maintenance position), the on-off state (closing position and separating brake position) and the operating characteristic of actual circuit breaker. The contactor for the simulation physical removal type (high-low voltage) circuit breaker simulates the main circuit part of the circuit breaker, so that the cost of the circuit breaker is greatly reduced, and the service life of the circuit breaker is prolonged.

The embodiment of the utility model also provides an emulation (physics) load. The simulated physical load can simulate the impedance of a simulated actual load, so that the load current in a primary loop of the power system can be simulated.

The embodiment of the utility model provides a still provide an electric power system secondary circuit. The power system secondary circuit real control circuit, the protection circuit, the measurement circuit, the signal circuit, the automatic device, the power system and the comprehensive automatic monitoring system (SCADA system) are connected with the power system primary circuit simulation physical model together to acquire and monitor the data of the power system primary circuit simulation physical model, so that a complete power simulation operation system is formed. The secondary circuit of the power system can realize data acquisition and monitoring of the power system primary circuit simulation physical model, and a complete power simulation operation system is formed.

The utility model discloses above-mentioned each embodiment adopts safe voltage (for example 34V) actual physical equipment to build the primary main loop of electric power system for operation process and the characteristic of the primary main loop of qualitative (ration in the certain limit) analog simulation high voltage electric power system have realized the complete real-time analog simulation of system parameter of the primary main loop of high voltage electric power system. In order to complete the primary main loop building of the power system, specific simulation physical equipment in the loop can meet the overall design requirement, and the parameters, the operation functions and the specific improved design of the circuit of the specific physical equipment (a simulation physical power supply, a simulation physical withdrawable high-voltage circuit breaker, a simulation physical current transformer and the like) are realized, so that the training and the examination of the power system under the safe voltage become possible.

The system is connected with an actual secondary loop of the power system through a standard interface to form a complete power simulation operation system, actual high-voltage equipment can be operated by the device, trained personnel can have real equipment operation experience, and meanwhile, the device is synchronous with the equipment operation process, a power system primary loop simulation physical model can reflect the change of various electrical parameters and various signals of the system in real time, the change can be collected by the real secondary loop in real time and is displayed to the trained personnel through various instruments and information display windows, so that the trained personnel can be completely placed in a real field environment (but the safety risk of real field can not exist), and the training effectiveness can be greatly improved. Compare with existing training and examination mode, the embodiment of the utility model provides an this whole training platform has advantages such as integrality, authenticity, security and maneuverability.

The following is a detailed description of an example:

fig. 3 is a simulated (actual) 10kV distribution system primary loop, in which 13 is a simulated physical power supply, 14 is a bus (for example, 10kV I-section bus), and 15 is a simulated physical load, and a simulated physical model of the 10kV distribution system primary loop corresponding to the simulated physical power supply is shown in fig. 4.

As shown in fig. 4, a three-phase alternating current 400V (marked AC 400V in fig. 4) power supply system is converted into a power supply system with a three-phase alternating current safe voltage (for example, 34V) neutral point and operated by grounding through a small resistor through a simulated physical power transformer 401, the voltage signal of 34V, the voltage signal converted through PT1 and PT2 (the transformation ratios of two PTs are 34/100), and a secondary circuit standard interface 403 are connected to a measuring instrument of a secondary circuit system and a relay protection 501 (as shown in fig. 5), so that the devices can detect the voltage change of a 10kV power distribution system primary circuit simulated physical model system in real time, and set the transformation ratio parameters of the devices to 10000/100, so that the voltage signal change of 0 to 34V in the 10kV power distribution system primary circuit simulated physical model, and the voltage signal change of 0 to 10000V in the instrument and the relay protection of the secondary circuit system, therefore, the purpose of simulating the real-time voltage signal of the 10kV power system is achieved. Wherein 401 is an emulated physical power transformer, 402 is a live display, 403 is a voltage signal and secondary loop standard interface, 404 is a measured current signal and secondary loop standard interface, 405 is a protection current signal and secondary loop standard interface, 406 is a voltage signal and secondary loop standard interface, and 15 is an emulated physical load.

Three 34V indicator lamps (see 402 in figure 4) are connected into a star-shaped connection and then connected into a 10kV power distribution system primary loop simulation physical model to simulate a 10kV electrified display, and when the three indicator lamps are turned on, the 10kV system is electrified.

As shown in fig. 4, C0-C6 are ac contactors, wherein C0 is used for simulating the working position of a PT1 handcart (i.e., when the PT1 handcart is in the working position, C0 is controlled by a PT1 handcart working position contact to be electrified and attracted, the PT1 handcart is not in the working position, the position contact is not on, and C0 is in an off state); in the same way, C1 is used for simulating the working position of the isolation handcart; the C2, the C4 and the C5 are respectively used for simulating the working positions of a simulation incoming line circuit breaker handcart, a metering handcart and a feed-out line circuit breaker handcart; the C3 and the C6 are respectively used for simulating the opening and closing states (controlled by the auxiliary contacts of the circuit breakers) of the simulation incoming line circuit breaker and the feed-out line circuit breaker; the C7 is used for simulating the on-off state of the grounding knife switch of the simulation feed-out line (controlled by the auxiliary contact of the grounding knife switch).

Fig. 6 is a schematic diagram of a current signal and secondary circuit standard interface structure according to an embodiment of the present invention. As shown in fig. 4, CT 1-CT 3 (10/5 simulated 200/5), CT 7-CT 9 (10/5 simulated 200/5), and CT 11-CT 13 (5/5 simulated 100/5) respectively convert the main loop current signals of the incoming line, the metering cabinet, and the outgoing line, and access the converted main loop current signals to the measuring instrument (such as the device 601 shown in fig. 6) of the secondary loop system through the measured current signal and the standard interface of the secondary loop, so that the instruments can detect the change of the primary loop current of the primary loop simulated physical model of the 10kV distribution system in real time, and set the transformation ratio parameters of the instruments as the actual device transformation ratio (such as 200/5), so that the simulated load current (such as 0-3A) signal change in the primary loop simulated physical model of the 10kV distribution system is reflected as a current signal change of 0-60A in the instrument of the secondary loop system, therefore, the purpose of simulating real-time current signals of a 10kV power system is achieved. CT 4-CT 6 (10/5 simulation 200/5) and CT 14-CT 16 (5/5 simulation 100/5) respectively convert the main loop current signals of the incoming line and the outgoing line, and then access the main loop current signals to a relay protection device (such as the device 602 shown in fig. 6) of the secondary loop system through a protection current signal and a standard interface of the secondary loop.

Fig. 7 is an internal simulation control circuit of the withdrawable circuit breaker, which is designed with a standard withdrawable circuit breaker secondary plug (i.e., a standard interface), and can be actually connected to a circuit of the central switchgear to replace the operation of a real withdrawable circuit breaker (the complete secondary control circuit is shown in fig. 8). The function of the circuit breaker for closing and opening the main circuit is realized by using a control contact (labeled as A3 contact point in figure 7) provided by an internal simulation control circuit of the withdrawable circuit breaker to control the closing and opening of the contactor (the circuit is shown in figure 9). In fig. 7, reference numerals a to F denote an electromagnetic hold relay, a1 to F1 denote a closing coil of the electromagnetic hold relay, a2 to F2 denote an opening coil of the electromagnetic hold relay, A3 to F3 denote output contacts of the electromagnetic hold relay, KT denotes a time relay, G denotes a contact of a test position limit switch of a simulated physical removal (high-low voltage) circuit breaker, H denotes a contact of an operation position limit switch of the simulated physical removal (high-low voltage) circuit breaker, and 1 to 22 denote secondary plug terminals of the simulated physical removal (high-low voltage) circuit breaker.

In fig. 8, the reference sign + KM is the positive pole of the control power supply, -KM is the negative pole of the control power supply, + CM is the positive pole of the switch-on energy storage power supply, -CM is the negative pole of the switch-on energy storage power supply, SFS1 is the switch-on/switch-off control switch, SFS2 is the remote/local control switch, I1 is the remote switch-on, I2 is the remote switch-off, I3 is the protection switch-off, 1-3, 13-18, 21-22 are the secondary plug terminals of the simulated physical moving-apart (high and low voltage) circuit breaker shown in fig. 7, and the circuit in the corresponding dashed frame is the internal circuit of the simulated physical moving-apart (high and low voltage) circuit breaker.

In fig. 8, reference characters C2 are contactors, L1-L3 are three-phase bus bars of a primary circuit of a simulation physical model of a power system, a1-a2 are control coil terminals of a C2 contactor, 5-6 are secondary plug terminals of the simulation physical removal-type (high-low voltage) circuit breaker shown in fig. 7, and circuits in corresponding dotted line frames are internal circuits of the simulation physical removal-type (high-low voltage) circuit breaker.

In the embodiment of the present invention, the single-phase impedance value of the emulated physical load is determined by the current value of the analog simulation, for example, if the load current of the emulated 60A is provided, the 10kV distribution system primary loop emulated physical model only needs to provide the current of 3A, and then the single-phase impedance Z of the emulated physical load is (Ue/1.732)/Ie is (34/1.732)/3 is 6.54 Ω.

In practical operation, the method can be implemented as follows:

according to the specific requirements of a primary loop of the power system, a system main wiring mode is designed, power supply voltage is selected according to load requirements, power supply capacity is calculated, and specific parameters of all primary simulation physical equipment in the primary loop of the power system are calculated and selected on the basis.

The simulation physical equipment (shown in figure 1: a simulation physical power supply 13, a bus 14, simulation

physical loads

15 and 1 to 12) is customized according to specific parameters and is connected and assembled in a main wiring mode to form a power system primary circuit simulation physical model.

The power system training and checking device is characterized in that a standard interface of a power system primary circuit simulation physical model is connected with a real power system secondary circuit to form a complete power system training and checking device.

Designing and manufacturing a primary loop fault simulation device of the power system, and accessing fault simulation hardware equipment into a primary loop simulation physical model of the power system through a standard interface to realize the simulation of various primary loop faults of the power system.

Fig. 8 is a flowchart of a control method suitable for an electric power simulation operation system according to an embodiment of the present invention. The power simulation operation system comprises a simulation physical model of a primary loop of the power system and a secondary loop of the power system; the simulation physical model of the primary loop of the power simulation operation system comprises a simulation load for simulating the load in the primary loop of the power simulation operation system, a power supply for simulating the high-voltage grade in the primary loop of the power simulation operation system, a power transformer, a current transformer and a simulation power supply for simulating the low-voltage grade of a voltage transformer, a simulation current transformer and a simulation voltage transformer.

The control method comprises the following steps: step 801, connecting the secondary loop of the power system with the loop simulation physical model of the primary loop of the power system, and performing data acquisition and monitoring on the simulation physical model of the primary loop of the power system.

And 802, setting the connection modes of the simulation power supply, the simulation transformer, the simulation current transformer and the simulation voltage transformer in the same mode as the connection modes of the high-voltage-level power supply, the power transformer, the current transformer and the voltage transformer in the primary loop of the power simulation operation system so as to simulate various real-time electrical parameters in the operation process of the primary loop of the power simulation operation system.

The power system primary loop simulation physical model comprises a simulation transformer, and the ratio of the primary side voltage to the secondary side voltage of the simulation transformer is at least one of the following ratios: less than or equal to 20: 1; less than or equal to 10: 1; less than or equal to 5: 1; less than or equal to 2: 1; and equal to 1: 1.

the primary side voltage and the secondary side voltage of the simulation transformer are 34V. The power system primary loop simulation physical model comprises a simulation power supply which is a low-voltage power supply with a neutral point directly grounded. The power system primary loop simulation physical model comprises a simulation current transformer, and the ratio of the primary side current to the secondary side current of the simulation current transformer is at least one of the following ratios: less than or equal to 50: 1; less than or equal to 20: 1; less than or equal to 10: 1; less than or equal to 5: 1; less than or equal to 2: 1; and equal to 1: 1.

The primary side current of the simulation current transformer is at least one of the following various values: less than or equal to 100A; less than or equal to 50A; less than or equal to 20A; less than or equal to 10A. The power system primary loop simulation physical model comprises a simulation voltage transformer, and the ratio of the primary side voltage to the secondary side voltage of the simulation voltage transformer is at least one of the following ratios: less than or equal to 1: 1; less than or equal to 0.5: 1; equal to 34: 100.

The primary side voltage of the simulated physical voltage transformer is at least one of the following values: less than or equal to 100V; less than or equal to 50V; equal to 34V. The artificial load is used for simulating the impedance of the power system primary loop, so that the load current in the power system primary loop is simulated. The power system secondary circuit comprises a control circuit, a protection circuit, a measurement circuit, a signal circuit, an automatic device, a power system and a comprehensive automatic monitoring system, and is connected with the power system primary circuit simulation physical model for data acquisition and monitoring.

The utility model discloses each electric power simulation operation system provides a real, complete, safe training environment for the electrical specialty student, can carry out analog simulation to the overall process, the overall system of electric power system operation. The application of the various simulation technologies greatly reduces the manufacturing cost of the device, simultaneously reduces the requirements of the device on installation places, is suitable for wide popularization and application in the field of training and examination, and plays a great role in promoting the training and examination work of electrical professionals.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A power simulation operation system is characterized by comprising a simulation physical model of a primary loop of a power system and a secondary loop of the power system, wherein the secondary loop of the power system is connected with the simulation physical model of the primary loop of the power system and is used for acquiring and monitoring data of the simulation physical model of the primary loop of the power system;

the simulation physical model of the primary loop of the power simulation operation system comprises: the simulation load is used for simulating the load in the primary loop of the power simulation operation system, the simulation power supply is used for simulating the low-voltage level of the power supply with the high-voltage level in the primary loop of the power simulation operation system, the simulation transformer is used for simulating the power transformer in the primary loop of the power simulation operation system, the simulation circuit breaker is used for simulating the circuit breaker in the primary loop of the power simulation operation system, the simulation current transformer is used for simulating the current transformer in the primary loop of the power simulation operation system, and the simulation voltage transformer is used for simulating the voltage transformer in the primary loop of the power simulation operation system;

the connection mode of the simulation power supply, the simulation transformer, the simulation circuit breaker, the simulation current transformer and the simulation voltage transformer is the same as that of the power supply with high voltage level, the power transformer, the current transformer and the voltage transformer in the primary loop of the power simulation operation system, so that various real-time electrical parameters in the operation process of the primary loop of the power simulation operation system are simulated.

2. The power simulation operation system according to claim 1, wherein the power system primary loop simulation physical model comprises a simulation transformer, and a ratio of a primary side voltage and a secondary side voltage of the simulation transformer is at least one of the following ratios:

3. the power simulation operation system according to claim 2, wherein the primary-side voltage and the secondary-side voltage of the simulation transformer are 34V.

4. A power simulation run system according to any of claims 1-3, wherein the power system primary loop simulation physics model comprises a simulation power supply, the simulation power supply being a low voltage power supply with a neutral point directly connected to ground.

5. The power simulation operation system according to claim 1 or 2, wherein the power system primary loop simulation physical model comprises a simulation current transformer, and the ratio of the primary side current to the secondary side current of the simulation current transformer is at least one of the following ratios:

6. the power analog operation system according to claim 5, wherein the primary side rated current of the emulated current transformer is at least one of the following values: less than or equal to 100A; less than or equal to 50A; less than or equal to 20A; less than or equal to 10A.

7. The power simulation operation system according to claim 1 or 2, wherein the power system primary loop simulation physical model comprises a simulation voltage transformer, and the ratio of the primary side voltage to the secondary side voltage of the simulation voltage transformer is at least one of the following ratios:

less than or equal to 1: 1; less than or equal to 0.5: 1; equal to 34: 100.

8. the power analog operation system according to claim 7, wherein the primary side rated voltage of the artificial voltage transformer is at least one of the following values:

less than or equal to 100V; less than or equal to 50V; equal to 34V.

9. A power simulation run system according to claim 1 or 2, wherein the power system primary loop simulation physics model comprises a simulated circuit breaker that employs an electromagnetic hold relay to simulate the mechanical hold characteristics of the circuit breaker.

10. A power simulation operation system according to claim 1 or 2, wherein the artificial load is used to simulate the impedance of the primary loop of the power system, thereby simulating the load current in the primary loop of the power system.